Evidence row 407516

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://ontarioprotocol.com/api/x402/base/gas"
    ]
  ],
  "name": "Ontario Protocol",
  "owner_address": "0xa2d72abf2c5e939fddca4156b74de482e03ca3ec",
  "raw": {
    "accepts": [
      {
        "amount": "1500",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "quote_expires_at": 1793071407,
          "quote_id": "23d9542a13d942a594b833999ab01975",
          "resourceUrl": "https://ontarioprotocol.com/api/x402/base/gas",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xa2d72aBF2C5e939fdDCA4156B74dE482e03CA3ec",
        "scheme": "exact"
      }
    ],
    "description": "What does a Base transaction cost right now? Base fee, priority-fee p25/p50/p90 over the last 20 blocks, suggested maxFeePerGas and maxPriorityFeePerGas for slow, normal and fast inclusion, an L1 data-fee upper bound, and estimated total cost in wei for an ETH transfer and an ERC-20 transfer, read live from Base RPC with the block number. $0.0015 USDC on Base. Failed read, no charge. No account, no API key. Estimates, not inclusion guarantees. By Ontario Protocol.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "blocks": 20
            },
            "type": "http"
          },
          "output": {
            "example": {
              "assumptions": {
                "base_fee": "base fee of the next block",
                "blocks_sampled": 20,
                "erc20_transfer_gas": 65000,
                "erc20_transfer_unsigned_tx_bytes": 175,
                "estimate_formula": "gas * (base_fee + p50 tip) + L1 data-fee upper bound",
                "eth_transfer_gas": 21000,
                "eth_transfer_unsigned_tx_bytes": 110,
                "max_fee_formula": "2 * base_fee + priority_fee",
                "priority_fee_method": "median across the sampled blocks of each block's gas-weighted 25th, 50th and 90th percentile tip (eth_feeHistory)"
              },
              "base_fee_wei": "5000000",
              "block": 53049909,
              "estimate_includes_l1_fee": true,
              "estimated_total_wei": {
                "erc20_transfer": "390565949161",
                "eth_transfer": "126389167165"
              },
              "l1_fee_upper_bound_wei": {
                "erc20_transfer": "565949161",
                "eth_transfer": "389167165"
              },
              "network": "eip155:8453",
              "note": "Estimates, not inclusion guarantees. Wei amounts are decimal strings.",
              "priority_fee_wei": {
                "p25": "1000000",
                "p50": "1000000",
                "p90": "5800000"
              },
              "read_at": "2026-10-25T00:46:05Z",
              "schema": "ontario.base_gas.v1",
              "source": "Base RPC",
              "suggested": {
                "fast": {
                  "max_fee_per_gas": "15800000",
                  "max_priority_fee_per_gas": "5800000"
                },
                "normal": {
                  "max_fee_per_gas": "11000000",
                  "max_priority_fee_per_gas": "1000000"
                },
                "slow": {
                  "max_fee_per_gas": "11000000",
                  "max_priority_fee_per_gas": "1000000"
                }
              }
            }
          }
        },
        "schema": {
          "properties": {
            "input": {
              "properties": {
                "queryParams": {
                  "additionalProperties": false,
                  "properties": {
                    "blocks": {
                      "default": 20,
                      "description": "Optional number of recent blocks the fee percentiles cover, 5 to 50. Default 20.",
                      "maximum": 50,
                      "minimum": 5,
                      "type": "integer"
                    }
                  },
                  "type": "object"
                }
              },
              "required": [
                "queryParams"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "additionalProperties": true,
                  "type": "object"
                }
              },
              "required": [
                "example"
              ],
              "type": "object"
            }
          },
          "required": [
            "input",
            "output"
          ],
          "type": "object"
        }
      }
    },
    "iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1792947859/bazaar-icons/8374ff393e7c4b50.png",
    "lastUpdated": "2026-10-27T03:18:27.892Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-26T01:14:51.322Z"
    },
    "resource": "https://ontarioprotocol.com/api/x402/base/gas",
    "serviceName": "Ontario Protocol",
    "tags": [
      "base gas price",
      "gas fee estimate",
      "maxFeePerGas",
      "base"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "What does a Base transaction cost right now? Base fee, priority-fee p25/p50/p90 over the last 20 blocks, suggested maxFeePerGas and maxPriorityFeePerGas for slow, normal and fast inclusion, an L1 data-fee upper bound, and estimated total cost in wei for an ETH transfer and an ERC-20 transfer, read live from Base RPC with the block number. $0.0015 USDC on Base. Failed read, no charge. No account, no API key. Estimates, not inclusion guarantees. By Ontario Protocol."
}

What the leaf hashes

{"body":"cfae1774467f61948f47c7d951df2b628f7eb2be457f0e01e7fa0974f78c0721","id":407516,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793080249014780,"prev":19873,"subject":"x402_bazaar:https://ontarioprotocol.com/api/x402/base/gas","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-27 (273461 rows).

1. 0x7a42d1a00d329009496cc3fe166608577ebb53f1d7675638d2c1fa66da391d43
2. 0xa84ecb1c923a8e5efa20b845f6a0d369a1ac520b5151fa6fb3363a295a11e2f2
3. 0x0b5e3359ed2fe01cb17baf62de2487fb6c11fa60c2cd152d7b89fd0bf91790e1
4. 0x1beee121d757bb9c172147000339a5452bcd74d12966f54739879236f4f90b55
5. 0xa37128eff7633ac551ece861e5c24acedc8a7b3f4425bef4d9884c8823f49096
6. 0x5980b3dad255eb4811dad9f815e37142fc92cbe49798605bc994538fb31d95d3
7. 0xcf90fe294d286658f3cc2de429f467b32a49d3886ef47ecfc7cf3eb51aba4c23
8. 0x57ef9f1fb84400d3bc11e43a18323d5a71b10ac9946df2c7d24a2efd004b012b
9. 0xa2cab213aa2d823e9f94de7f447b2a92773478aeffbcd1323368337fb0c57ce6
10. 0xe9a5d1c6719d67a94924cfd78ac5d857dfe591b756d7a88a4f7a4692f2e58d71
11. 0x926531ee7b85e18ef250d5e2cf7f1fe039b14d7d9a1ebadd7e87f963de66741a
12. 0x0574b16d30fa9d3621e88c3779ea2cd142521826d4e75735f3ae6d4ed075cfc4
13. 0x8f2d125f5fe55a24b5da16577766eeaa13f24a272bb4c1c016f423ae917da681
14. 0x9848c068b1371232529d2b5738fdc45b854c57da041b69ea7c9e112b14e2d9d1
15. 0x275720ecabb68df33eee92ae4fd70572a8d952d6c61c061c2869cfc3217aa5c5
16. 0x23cf9bb4337ee8be7fcae368fd69d24c62c11fb45882127b4cd919bb96a19996
17. 0x0e01aa9525097570a6edaf32bfc959de57bf5c24317cf10c0716affea85ca60d
18. 0xa20d48798a34aba12eb9c7297722982d910f06c148f5e27ac59307422964a585
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4